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906. Unlike transplants between identical twins, whose genetic endowment is the same, all patients receiving hearts or other organs must take antirejection drugs for the rest of their lives.

(A) Unlike transplants between identical twins, whose genetic endowment is the same
(B) Besides transplants involving identical twins with the same genetic endowment
(C) Unless the transplant involves identical twins who have the same genetic endowment
(D) Aside from a transplant between identical twins with the same genetic endowment
(E) Other than transplants between identical twins, whose genetic endowment is the same

906. Unlike transplants between identical twins, whose genetic endowment is the same, all patients receiving hearts or other organs must take antirejection drugs for the rest of their lives.

(A) Unlike transplants between identical twins, whose genetic endowment is the same(B) Besides transplants involving identical twins with the same genetic endowment(C) Unless the transplant involves identical twins who have the same genetic endowment(D) Aside from a transplant between identical twins with the same genetic endowment(E) Other than transplants between identical twins, whose genetic endowment is the same

I am confused here. All the options seem to have been comparing transplant(s) with all patients. How come C is different than the rest of choices? _________________

If you know what you're worth, then go out and get what you're worth. But you gotta be willing to take the hits, and not pointing fingers saying you ain't where you wanna be because of anybody! Cowards do that and You're better than that!The path is long, but self-surrender makes it short; the way is difficult, but perfect trust makes it easy. Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.Failure establishes only this, that our determination to succeed was not strong enough.Getting defeated is just a temporary notion, giving it up is what makes it permanent.

Instead of looking at it from the point of view of comparison, let's look at it from the angle modification. ABD and E are sentences starting with a participial phrase modifying the noun ‘all patients.’ Therefore you can not dispense with necessity of modification from these choices. C alone among the choices uses a subordinate clause with its own subject and verb, totally obviating the need for modification. A subordinate clause is not required to modify the main clause but only has to depend upon it for completion of the meaning. That is the reason C is different from the rest _________________

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